砒毒砂

例句：

1. 1. The poisonous substance was found in the river near the city.
   在城市附近的河流里发现了这种有毒物质。
2. 2. The doctor warned us to avoid contact with this poisonous substance.
   医生警告我们要避免接触这种有毒物质。
3. 3. The villagers were forced to leave their homes due to the danger of exposure to the poisonous substance.
   由于暴露于有毒物质的危险，村民们被迫离开他们的家园。